Cod sursa(job #861628)
Utilizator | Data | 21 ianuarie 2013 20:00:34 | |
---|---|---|---|
Problema | Sum | Scor | 50 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.39 kb |
#include<fstream>
using namespace std;
int i,j,n,v[100001],x;
int main()
{
ifstream f("sum.in");
ofstream g("sum.out");
f>>n;
for(i=1;i<=100000;i++)
v[i]=i;
for(i=2;i<=100000;i++)
if(v[i]==i)
for(j=i;j<=100000;j+=i)
v[j]=v[j]/i*(i-1);
for(i=1;i<=n;i++)
{
f>>x;
g<<(long long)v[x]*2*x<<endl;
}
}